UA 3532 then AC 524 at O'Hare
Knoxville → Chicago → Montréal
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
15:50AC 524 to Montréal leaves the gate
21 h 07 apart on the timetable, overnight
AC 524 leaves 21 h 07 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.